It means that there were multiple Lugers produced in 1939
with the same numerical serial number as your, nd yours was produced in the "w" production run...
You should make sure that this "w" is recorded on any official paperwork related to this pistol as part of the serial number.
Paperwork like Insurance records, firearms registrations (if you need them in your state) and estate inventories...
That "w" distinguishes your Luger from the others that are stamped with the same numerical serial number...
-regards,
John
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